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(Click for frequent words.) 78 astronomers 74 Astrophysicists 71 Scientists 70 Physicists 69 Cosmologists 66 astrophysicists 63 Amateur astronomers 62 X ray Observatory 61 distant galaxies 61 Geologists 61 galaxies 61 globular clusters 61 ASTRONOMERS 61 quasars 61 extrasolar planets 60 Spitzer Space Telescope 60 planets orbiting 59 planets orbiting distant 59 Paleontologists 59 Seismologists 59 extrasolar planet 59 Earthlike planets 59 planets 59 globular cluster 58 planet orbiting 58 brown dwarfs 58 Biologists 58 gamma ray bursts 58 Kepler #b 58 Planetary scientists 57 supernovae 57 exoplanets 57 Saturn rings 57 rocky planets 57 cosmologists 57 Researchers 57 astronomer 57 galaxy clusters 57 quasar 57 gamma ray burst 57 XMM Newton 57 skywatchers 57 SN #gy 57 planets astronomers 57 distant quasars 57 red supergiant 56 Saturn moons 56 supernova 56 brown dwarf 56 NASA Chandra 56 brightest supernova 56 Stargazers 56 Gamma ray bursts 56 exoplanet 56 elliptical galaxies 56 super Earths 56 Orion Nebula 56 gaseous planet 56 galaxy cluster 56 Archaeologists 56 planets orbiting stars 56 CoRoT satellite 56 dwarf galaxies 55 Climatologists 55 Fomalhaut b 55 AGNs 55 protoplanet 55 Archeologists 55 gravitational microlensing 55 habitable planets 55 KBOs 55 GRBs 55 Milky Way galaxy 55 neutron star 55 Corot 7b 55 supernovas 55 radial velocity 55 supernova remnant 55 distant galaxy 55 X ray observatories 55 extrasolar 55 distant supernovae 55 exoplanetary 55 Milky Way 55 GRB #B 55 Astronomy buffs 55 Andromeda Galaxy 55 magnetars 55 X ray observatory 54 Hanny Voorwerp 54 transiting planets 54 comets 54 Anthropologists 54 pulsars 54 X ray telescopes 54 HD #b [002] 54 millisecond pulsars 54 Solar System 54 nebulae 54 RS Ophiuchi 54 microlensing 54 neutron stars 54 Oort cloud 54 colliding galaxies 54 COROT 54 magnetar 54 Kuiper belt objects 54 planets circling 53 Skywatchers 53 Epsilon Aurigae 53 globular star 53 Omega Centauri 53 Galaxy Evolution 53 dwarf galaxy 53 Milky Way Galaxy 53 optical telescopes 53 distant quasar 53 GRB # 53 planets orbiting sun 53 nebula 53 Crab Nebula 53 ray Space Telescope 53 X ray binary 53 protoplanetary disks 53 NASA Kepler spacecraft 53 hot Jupiters 53 cosmic microwave background 53 Neuroscientists 53 NASA Far Ultraviolet 53 PASADENA Calif. Astronomers 53 luminous galaxies 53 pulsar 53 HD# [002] 53 planetary nebulae 53 Andromeda galaxy 53 gravitational waves 53 gravitational lenses 53 microlensing events 53 planet HD #b 53 ESA XMM Newton 53 protostars 52 comet 52 exoplanets orbiting 52 Epsilon Eridani 52 galaxy 52 skygazers 52 Mathematicians 52 SN #A 52 extrasolar planetary systems 52 planetary nebula 52 proto galaxies 52 NASA Wilkinson Microwave 52 trans Neptunian objects 52 Fermi telescope 52 NASA Cassini spacecraft 52 intrinsic brightness 52 planemos 52 sunlike stars 52 physicists 52 comet nucleus 52 Galilean moons 52 exo planets 52 Gliese #g 52 Earthlike planet 52 GJ #b [002] 52 novae 52 NASA Kepler 52 telescopes 52 spacecraft Cassini 52 orbiting Cassini spacecraft 52 terrestrial planets 52 Type Ia supernova 52 telescope 52 Space Telescope 52 Keck telescope 52 Volcanologists 52 Cassini spacecraft 52 WM Keck Observatory 51 Theorists 51 icy moons 51 supernova explosion 51 GJ #b [001] 51 Keck Telescope 51 Supernovae 51 starburst galaxies 51 Keck telescopes 51 Palaeontologists 51 HD#b 51 Saturn moon 51 BP Psc 51 exoplanet orbiting 51 extrasolar planets orbiting 51 orbiting Chandra 51 ESO VLT 51 protostar 51 Oort Cloud 51 solar corona 51 spiral galaxy 51 celestial object 51 Particle physicists 51 smallest exoplanet 51 Anisotropy Probe WMAP 51 constellation Cassiopeia 51 Kuiper Belt Object 51 X ray emission 51 Evolution Explorer 51 Cepheids 51 Voorwerp 51 Kuiper belt 51 amateur astronomers 51 Galilean satellites 51 planet Uranus 51 galaxy formation 51 ESO Very Large Telescope 51 Famed astrophysicist Stephen Hawking 51 protoplanetary disk 51 OGLE 51 asteroids orbiting 51 Hubble observations 51 AB Aurigae 51 supermassive black holes 51 Bok globules 50 Higgs particle 50 supernova remnants 50 CoRoT 50 spiral galaxy NGC 50 Comet Hartley 2 50 Pluto Charon 50 planetary Transits 50 star Gliese 50 starburst galaxy 50 blazar 50 XMM Newton satellite 50 microquasar 50 Upsilon Andromedae 50 Quadrantid meteor shower 50 G#.# +#.# 50 WMAP satellite 50 celestial objects 50 Red Rectangle 50 cosmological distances 50 planet orbits 50 HL Tau 50 Active Galactic Nuclei 50 Comet Holmes 50 type Ia supernova 50 WIMPs 50 moons orbiting 50 NASA STEREO 50 Comet Lulin 50 globulars 50 Saturnian moon 50 supermassive 50 quark gluon plasma 50 sized planets orbiting 50 habitable zones 50 barred spiral galaxy 50 galaxy NGC 50 distant galaxy clusters 50 WASP #b 50 moon Io 50 Beta Pictoris b 50 SCIENTISTS 50 plutoids 50 accretion disks 50 Enceladus 50 supergiant stars 50 X ray wavelengths 50 solar nebula 50 Higgs bosons 50 Astronomer 50 orbiting Hubble Space Telescope 50 active galactic nuclei 50 Neutron stars 50 proplyds 50 HealthDay News Researchers 50 gamma ray observatory 50 gravitational lensing 50 Type 1a supernovae 50 chondrules 50 NASA Fermi Gamma 50 exo planet 50 spectroscopic observations 50 astronomical objects 50 merging galaxies 50 Geneticists 50 Milky Way halo 50 Kuiper Belt object 49 astronomical observations 49 redshift 49 Orionids 49 moon Titan 49 Fossil hunters 49 Type Ia supernovae 49 Nasa Kepler 49 astrometry 49 Cassini flyby 49 Microlensing 49 optical interferometry 49 asteroids 49 Geochemists 49 periodic dimming 49 reionization 49 Kuiper Belt Objects 49 Zeta Ophiuchi 49 habitable worlds 49 BLG #Lb 49 CMEs 49 Cassini Huygens spacecraft 49 substorms 49 planets orbits 49 Saturnian moon Titan 49 supergiant star 49 type Ia supernovae 49 CoRoT #b 49 Submillimeter Array 49 galaxy M# [002] 49 Saturn moon Enceladus 49 NASA Cassini 49 Exoplanets 49 ultraviolet wavelengths 49 chemical abundances 49 Eta Carinae 49 Nasa spacecraft 49 celestial bodies 49 CoRoT 7b 49 galaxy M# [001] 49 unaided eye 49 Observatories 49 AU Mic 49 Astrobiologists 49 moons 49 aurorae 49 Henize #-# 49 Earthlike 49 interstellar cloud 49 Bug Nebula 49 spiral galaxies 49 infrared telescopes 49 Beta Pictoris 49 Hot Jupiters 49 permanently shadowed craters 49 faint galaxies 49 Observatory telescope 49 earthlike planets 49 Wilkinson Microwave Anisotropy Probe 49 Gravitational waves 49 gravitationally bound 49 moon Enceladus 49 Telescope 49 telescopes astronomers 49 Comet Tempel 1 49 TrES 4 49 Nikku Madhusudhan 49 La Silla Chile 49 Cosmic rays 49 stargazers 49 Stephan Quintet 49 asteroid 49 Large Magellanic Cloud 49 outer planets 49 chondrites 49 Botanists 49 infrared wavelengths 49 Cepheid variables 49 accretion disk 49 comets orbiting 49 HARPS spectrograph attached 49 Lagoon Nebula 49 galactic nuclei 49 Using ESO Very 49 neutrino particles 49 CoRoT 9b 49 Rosette Nebula 49 stellar nurseries 48 innermost planet 48 Mauna Kea Hawaii 48 Pan STARRS 48 Geminids 48 Planetary Transits 48 Wolszczan 48 Computer simulations 48 Trojan asteroids 48 Extrasolar planets 48 protoplanets 48 infrared observatory 48 Lulin 48 XTE J# 48 Kepler spacecraft 48 constellation Virgo 48 retrograde orbits 48 MicroFUN 48 Kuiper Belt 48 exosolar planets 48 transiting exoplanet 48 coronal mass ejections 48 Pieter van Dokkum 48 RHESSI 48 Samuel Oschin Telescope 48 Quaoar 48 hypervelocity stars 48 Leonids 48 galactic mergers 48 Arches Cluster 48 WMAP 48 foreground galaxy 48 planetary astronomer 48 Pleiades 48 Oceanographers 48 Cassini 48 cosmic cannibal 48 extragalactic 48 Quadrantids 48 red supergiants 48 Very Large Telescope 48 telescopic observations 48 supermassive black hole 48 constellation Ursa Major 48 Antennae Galaxies 48 observatories 48 gaseous planets 48 geochemists 48 Higgs Boson 48 elliptical galaxy 48 stellar occultations 48 CMB radiation 48 cosmic rays 48 solar flares 48 sky gazers 48 Planck satellite 48 P/# A2 48 Cat Paw Nebula 48 Betelgeuse 48 VLBA 48 distant supernovas 48 submillimeter wavelengths 48 Supernova #A 48 Anisotropy Probe 48 Kuiper belt object 48 Lyman alpha 48 Earths orbiting 48 spiral nebulae 48 Corot 9b 48 Keck Observatory 48 Astrophysics 48 nebular 48 icy comets 48 Martian meteorites 48 cosmic microwave radiation 48 orbiting 48 proto planetary disk 48 axions 47 RXTE 47 Alex Filippenko 47 zircon crystal 47 Very Large Array 47 meteor shower 47 NASA Opportunity rover 47 mu Arae 47 Uranus Neptune 47 exoplanet hunter 47 Great Observatories 47 HD #b [001] 47 Boffins 47 Kuiper Belt objects 47 Gemini telescopes 47 TW Hydrae 47 GRB #A 47 HESS telescopes 47 Toutatis 47 SDSS II 47 cosmic phenomena 47 NASA Mars Odyssey 47 scientists 47 SN#A 47 2MASS 47 potentially habitable planets 47 ultraluminous galaxy 47 sunlike star 47 gravitational wave 47 cosmic ray 47 asteroid Vesta 47 Hubble Space Telescope 47 millisecond pulsar 47 redshifts 47 lunar crust 47 constellation Carina 47 antimatter particles 47 supersymmetric particles 47 moon Charon 47 Zoologists 47 UVOT 47 Optical Gravitational Lensing Experiment 47 interstellar dust clouds 47 Southern Observatory ESO 47 Explorer WISE 47 Triangulum Galaxy 47 blazars 47 occultations 47 galactic clusters 47 fainter objects 47 eclipsing binary 47 baryonic 47 Comet Machholz 47 Alfven waves 47 dusty disks 47 interstellar dust 47 dinosaur species 47 spacecraft flyby 47 sterile neutrino 47 orbiting telescope 47 GJ#b 47 auroras 47 neutrino 47 protoplanetary 47 neutrinos 47 coronal mass ejections CMEs 47 Extrasolar Planet Search 47 astronomer Clyde Tombaugh 47 Type Ia supernovas 47 Astronomy 47 Gliese #c 47 constellation Ophiuchus 47 Gliese #d 47 Upsilon Andromedae b 47 asteroids comets 47 ejecta 47 astrophysical phenomena 47 SN #C 47 NASA Hubble Space 47 stellar seismology 47 KH #D 47 noctilucent clouds 47 Maunder minimum 47 Mount Stromlo Observatory 47 Carina Nebula 47 Comet #P 47 Orion nebula 47 Ulysses spacecraft 47 Super Earths 47 GALEX 47 Helix Nebula 47 astrometric 47 Mandushev 47 Cancri e 47 outer corona 47 Orionid 47 transiting planet 47 constellation Hercules 47 Galaxies 47 electron neutrinos 47 LORRI 47 Solar flares 47 Sky gazers 47 Adam Riess 47 Gliese 47 Virgo Cluster 46 ringed planet 46 Martian crater 46 magnetic reconnection 46 detect gravitational waves 46 AScribe Newswire Researchers 46 comet Lulin 46 galaxies collide 46 Meteorologists 46 radial velocity technique 46 supernova explosions 46 Fritz Zwicky 46 radial velocity method 46 Evolutionary biologists 46 Pleiades cluster 46 RRATs 46 Harvard exoplanet hunter 46 Cosmic Microwave Background 46 NASA Kepler telescope 46 Cancri 46 Convection Rotation 46 planet TrES 46 spectroscopically 46 planetary scientist 46 Galileo spacecraft 46 Grillmair 46 Cosmic Microwave Background CMB 46 infrared interferometry 46 inch Samuel Oschin 46 ROSAT 46 constellation Cetus 46 Halley comet 46 meteorite 46 exoplanets planets outside 46 planetary embryos 46 HAT P 46 planets moons 46 asteroseismology 46 filamentary structure 46 ANI NASAs 46 coronal loops 46 hydrated minerals 46 zodiacal light 46 SIRTF 46 Kepler 9c 46 Gondolo 46 Iapetus 46 UKIRT 46 SOHO spacecraft 46 Higgs boson particle 46 sunspots 46 astrophysical 46 COROT exo 3b 46 starlight 46 COROT 7b 46 orbiting Hubble telescope 46 optical telescope 46 Exoplanet 46 brightnesses 46 Demographers 46 LOFAR 46 Ornithologists 46 Cassini Huygens 46 HARPS spectrograph 46 planetary 46 Sedna 46 Wolf Rayet stars 46 Kepler Telescope 46 dimming starlight 46 constellation Cygnus 46 RY Sagittarii 46 infrared telescope 46 Proxima Centauri 46 cosmological theories 46 polarimetry 46 magnetic monopoles 46 Herschel Space 46 NASA MESSENGER spacecraft 46 Pegasus constellation 46 muon neutrinos 46 asteroid Lutetia 46 ESO telescopes 46 moonlets 46 SINFONI 46 auroral emissions 46 ULIRGs 46 asteroidal 46 #P/Churyumov-Gerasimenko 46 SEGUE 46 subatomic particles 46 Infrared Array Camera 46 Giovanni Cassini 46 SCP #F# 46 Voyager spacecraft 46 CHARA 46 Heliospheric Observatory SOHO 46 volcanically active 46 OGLE TR #b 46 proto cluster 46 astronomy 46 masers 46 icy moon Enceladus 46 Comet #P/Holmes 46 radiotelescope 46 Herschel telescope 46 inhabitable planets 46 star Fomalhaut 46 ESO PR 46 Jupiter Uranus 46 Dwarf galaxies 46 coronagraph 46 constellation Centaurus 46 Mimas 46 infrared spectrograph 46 cluster NGC 46 Space Telescope GLAST 46 Subaru telescope 45 dwarf planet 45 Mushotzky 45 inner Oort Cloud 45 Wide Angle Search 45 Saturn aurora 45 supermoon 45 gravitational radiation 45 meteorites 45 Orbiter LRO 45 Elliptical galaxies 45 Infrared Thermal Imaging Spectrometer 45 Danish astronomer Tycho 45 Fermi Gamma ray 45 IntergalaticEarth 45 gamma ray telescope 45 palaeontologists 45 planets Uranus 45 V# Mon 45 sodium atoms 45 substorm 45 Cassini imaging 45 exoplanets planets 45 J# +# [002] 45 undiscovered particle 45 HM Cancri 45 NGC# 45 Eagle Nebula 45 meteoroids 45 APXS 45 binary asteroid 45 meteor 45 shadowy craters 45 BP Piscium 45 Jupiter moon Io 45 constellation Lyra 45 moons circling 45 Perseus Cluster 45 Fomalhaut 45 gamma ray burst GRB 45 VY Canis Majoris 45 perihelion 45 retrograde orbit 45 ESA Integral 45 Telescopes 45 blue supergiant 45 Observatory STEREO 45 comet McNaught 45 aurora 45 photosphere 45 X ray spectrometer 45 Lyrids 45 NASA ESA Hubble 45 Sara Seager 45 God Particle 45 Mössbauer 45 theoretical particle 45 supernovae explode 45 star Proxima Centauri 45 atop Mauna Kea 45 Newswise Scientists 45 biosignatures 45 occultation 45 undersea volcanoes 45 pronounced elongation 45 plutoid 45 Earth asteroids 45 Ring Nebula 45 starquakes 45 Laser Interferometer Gravitational Wave 45 lunar poles 45 Spectrograph 45 astronomical phenomena 45 Entomologists 45 S/# P2 45 eclipsing binaries 45 Multi Object Spectrograph 45 dirty snowballs 45 Globular clusters 45 refurbished Hubble Space 45 planetesimals 45 astronomical telescope 45 cosmos 45 IRC +# 45 gamma ray bursts GRBs 45 phyllosilicates 45 Comet Hartley 45 VIRTIS 45 Pleiades star 45 exosphere 45 SN #D 45 Hubble astronomers 45 Orion constellation 45 Meteorites 45 lunar perigee 45 Astrophysical 45 transiting exoplanets 45 Comet Hale Bopp 45 X ray binaries 45 Tarantula Nebula 45 high redshift galaxies 45 moon Ganymede 45 occulted 45 Tycho supernova 45 celestial phenomena 45 IBEX spacecraft 45 rotating neutron stars 45 Astrophysical Journal 45 ionized hydrogen 45 corona 45 Epidemiologists 45 asterism 45 binary quasar 45 Saturn moon Iapetus 45 Climate Experiment GRACE 45 Geophysicists 45 Comet Halley 45 Ionosphere Sounding 45 Keck Interferometer 45 astrophysicist 45 TrES 45 Relations Observatory STEREO 45 Experts 45 Figer 45 cryovolcanism 45 Cepheid variable 45 IRAS 4B 45 sun corona 45 planetoid 45 SMBHs 45 Orionid meteors 45 auroral 45 orbiting gamma ray 45 High Accuracy Radial 45 TU# [002] 45 RS Oph 45 gravitational lens 45 Taurids 45 Kepler Mission 45 rocky extrasolar planet 45 SN #E 45 neutralinos 45 Near Infrared Camera 45 supergiants 45 Virgo cluster 45 gamma rays 45 ULP cepheids 45 Astrologers 44 Aurigid 44 Wilkinson Microwave Probe 44 HiRISE camera aboard 44 HII regions 44 Magnetars 44 smallest exoplanets 44 moons Phobos 44 giant elliptical galaxy 44 Type Ia 44 Ranging spacecraft 44 constellation Aquarius 44 highly elliptical orbits 44 Triangulum 44 giant elliptical galaxies 44 QQ# 44 Sunspots 44 N. Rathnasree 44 orbiting observatory 44 OGLE TR 44 Subaru Telescope 44 Perseids 44 Weather forecasters 44 Observatory LIGO 44 Titan Saturn 44 metallicity 44 orbits 44 Observers 44 astrophysical objects 44 interstellar clouds 44 Jupiter moons 44 interacting galaxies 44 astrobiologists 44 orbiting Mars 44 NASA Spirit rover 44 HARPS instrument 44 Sasselov 44 olivine mineral 44 cometary 44 Newswise Researchers 44 stellar occultation 44 Mpc 44 elliptical orbits 44 Sgr 44 Neurobiologists 44 GQ Lupi 44 Leonid meteor shower 44 R#a# 44 submillimetre wavelengths 44 observable universe 44 Helix nebula 44 afterglows 44 Cassiopeia 44 dust enshrouded 44 cosmological parameters 44 Pluto Eris 44 Nicolaus Copernicus 44 Omega Nebula 44 Palomar Observatory 44 Geminid meteor shower 44 hypernova 44 Astrophysicist 44 nightglow 44 Gamma ray 44 SWIFT J#.# 44 PSR B# +# 44 circumstellar disks 44 amateur stargazers 44 comet dust 44 Extraterrestrial Physics 44 ESO telescope 44 galactic cosmic rays 44 spectroscopic measurements 44 Solar Orbiter 44 INTEGRAL satellite 44 VB #b 44 optical spectra 44 WISE infrared 44 martian meteorites 44 Globular Cluster 44 constellation Taurus 44 Monoceros 44 nucleosynthesis 44 Wolf Rayet star 44 AKARI 44 weak gravitational lensing 44 orbited Jupiter 44 Jenniskens 44 Hubble Space Telescope HST 44 Popular Astronomy 44 Opportunity rover 44 potentially habitable 44 TNOs 44 Lowell Observatory 44 annual Perseid meteor 44 Pluto 44 SIM PlanetQuest 44 lensing galaxy 44 Hubble 44 particle smasher 44 Interstellar Boundary Explorer 44 astronomy buffs 44 Astronauts aboard 44 Saturn Cassini 44 HIRES spectrometer 44 gray hematite mineral 44 Conservationists 44 Uranus 44 Small Magellanic Cloud 44 Pegasi 44 baryon 44 amateur skywatchers 44 neutron spectrometer 44 NASA rover Opportunity 44 STEREO spacecraft 44 Io Europa 44 orbiting Saturn 44 submillimeter galaxies 44 Martian equator 44 proton collisions 44 Quadrantid 44 SNR #-#.# 44 Sociologists 44 star Beta Pictoris 44 reflection nebula 44 MARSIS 44 thrilling stargazers 44 called gravitational microlensing 44 Gamma ray Large 44 Sagittarius Window Eclipsing 44 Coma Cluster 44 Delta Cephei 44 relativistic jets 44 neutral mass spectrometer 44 Planetary nebulae 44 slender crescent 44 permanently shadowed 44 planet transits 44 cometary dust 44 De Pontieu 44 lunar craters 44 constellation Pegasus 44 SN Ia 44 Higgs boson 44 paleontologists 44 sunspot 44 Perseid meteor shower 44 adaptive optics 44 UB# [003] 44 Avishay Gal Yam 44 seismologists 44 boson 44 baryons 44 meteors 44 galactic bulge 44 cosmic magnifying glass 43 elliptical galaxy NGC 43 THEMIS satellites 43 NASA Great Observatories 43 Tarduno 43 planet magnetosphere 43 Extrasolar Planets 43 primordial ingredients 43 SMBH 43 Mario Livio 43 meteorite fragments 43 infall 43 supersymmetric 43 subatomic particle 43 smallest exoplanet ever 43 Martian craters 43 UDFy # 43 Kailash Sahu 43 Economists 43 gamma ray emission 43 Vulcanologists 43 NEAs 43 spiral galaxy M# 43 Leonid meteor showers 43 Observatory Very